Water-gage.



Patented May 23, 1905.

ATENE EErcEo JOSEPH MCAFEE, OF PHILADELPHIA, PENNSYLVANIA.

WATER-GAGE.

SPECIFICATION forming-part of Letters Patent No. 790,737, dated May 23, 1905.

Application led November l0, 1904. Serial NoA 232,070.

To all whom, 7175 may concern:

Be it known that I, JOSEPH MCAFEE, a citi- Zen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Water- Gages, of which the following is a specification.

My invention relates to water-gages forexhibiting the water-level in steam-boilers and for like purposes.

The object of my invention is the production of a water-gage possessing the general structural characteristics of t-hat shown and described in my application for Letters Patent of the United States filed September 12, 1904, Serial No. 224,119, so far as relates to the insertion of the packing, sight-glass, and pressure-retaining parts into the casting from the top, but employing screw action instead of wedge action to maintain the glass in the position to which it is pressed by the steam in rear of it.

I accomplish the object set forth by constructing and associating the parts as illustrated in the accompanying drawings, of which- Figure 1 is a vertical sectional view. Fig. 2 is a cross-section; and Fig. 3, a rear View of a modification, showing the employment of a plurality of screws.

Like letters refer to the same parts throughout.

The hollow casing A, of any chosen external form, has the usual opening in front, forming the sight of the gage, and a bearingsurface a upon the inside of the casing, extending entirely around the opening and which will be again referred to. Casing A has also the top opening B, and it is provided with suitable pipe connections C, enabling it to be joined to the boiler-fittings in any convenient manner. Through the opening B (see also Fig. 2) a link of packing D, customarily of triangular cross-section, is inserted and placed against the bearing-surface a, as illustrated. Through the mouth B the glass E is then inserted, and the inclined surface of the glass meets a surface of the packing D having like inclination and extent. A flat link of packing F is next inserted through the openingB and placed against the rear of the glass, and then the pressure-retainer Gr, having a hollow face and ports g leading' into the hollow at each end, is introduced through the opening B and placed against the flat link of packing F.

A screw H passes through the back of casing A, and to prevent leakage of steam at that point a washer of packing J is let into the casing, as shown, or placed upon it, and the nut K clamps the packing steam-tight around the screw.

The top of casing A is closed by the screwcap L, and one of the pipe connections C passes through the cap. When steam is let into the casing, the glass is pressed forward and the packing D compressed, forming a tight joint with the glass, as well as with the contiguous casing-surfaces. It is desired to retain the glass in the position to which it has been forced by the steam; otherwise when the pressure ceases the packing will expand, and the continued expansion and compression thus resulting each time the steam is applied and removed tends to create leaks around the edges of the glass. If, however, the pressure-retaining piece G is forced forward by screw I-I when steam is on, the glass will be held firmly forward and all joints kept tight.

I do not limit myself to a single screw H, placed in the middle of the casing, as shown in Figs. 1 and 2, but may occasionally employ a number of screws arranged to act upon the pressure-retainer at a number of points and to set up the glass at those points. By means of a number of screws, as shown in Fig. 3, different pressures may be exerted at different points around the edge of the glass where leaks occur.

Having thus described my invention and explained its mode of operation, what I claim 1. In a water-gage, lthe combination with the casing having a sight-opening and an end opening, the said casing having a packing bearing-surface extending around said sightopening interiorly, of packing adapted to be introduced through the said end opening and constructed to lit said packing bearing-sur- IOO face, a glass adapted to be introduced through said end opening and arranged against the said packing, a pressure-retainer adapted to be introduced through the said end opening, and screw-pressure means whereby said pressure-retainer is forced toward the glass.

2. In a water-gage, the combination with the casing having a sight-opening and an end opening, the said casing having a packing bearing-surface extending around said sightopening interiorly, of packing adapted to be introduced through the said end opening and constructed to fit said packing bearing-surface, a glass adapted to be introduced through said end opening and arranged against the said packing, a flat link of packing adapted to be introduced through said end opening in rear of thel glass, a pressure-retainer adapted to be introduced through the said end opening, and screw-pressure means whereby said pressure-retainer is forced toward the glass.

land pressure-screws disposed lto act at different points against the pressure-retainer whereby it is forced toward the glass.

In testimony whereof I afixmy signature in presence ofl two witnesses.

JOSEPH MGAFEE.

Witnesses: y

JAMES L. SAVAGE, JOHN WARNER. v 

